[ios] Remove hitTest UIKit workaround.

ios/chrome/browser/ui/omnibox/omnibox_text_field_ios.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/ui/omnibox/omnibox_text_field_ios.h"
 
 #import <CoreText/CoreText.h>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 772 matching lines @@
   // apply an image mask to fade out beginning and/or end of the URL.
   gfx::ScopedCGContextSaveGState saver(UIGraphicsGetCurrentContext());
   [super drawTextInRect:[self rectForDrawTextInRect:rect]];
 }
 
 - (UIView*)hitTest:(CGPoint)point withEvent:(UIEvent*)event {
   // Anything in the narrow bar above OmniboxTextFieldIOS view
   // will also activate the text field.
   if (point.y < 0)
     point.y = 0;
-  UIView* view = [super hitTest:point withEvent:event];
-
-  // For some reason when the |leftView| has interaction enabled, hitTest
-  // returns the leftView even when |point| is 50 pixels to the right.  Tapping
-  // the hint text will fire the leftView, causing b/6281652. Fails especially
-  // on iPad and iPhone devices in landscape mode.
-  // TODO(crbug.com/546295): Check to see if this UIKit bug is fixed, and remove
-  // this workaround.
-  UIView* leftView = [self leftView];
-  if (leftView) {
-    if (leftView == view && !CGRectContainsPoint([leftView frame], point)) {
-      return self;
-    } else if ([self leftViewMode] == UITextFieldViewModeAlways) {
-      CGRect targetFrame = CGRectInset([leftView frame], -5, -5);
-      if (CGRectContainsPoint(targetFrame, point)) {
-        return leftView;
-      }
-    }
-  }
-  return view;
+  return [super hitTest:point withEvent:event];
 }
 
 - (BOOL)isTextFieldLTR {
   return [[self class] userInterfaceLayoutDirectionForSemanticContentAttribute:
                            self.semanticContentAttribute] ==
          UIUserInterfaceLayoutDirectionLeftToRight;
 }
 
 // Overriding this method to offset the rightView property
 // (containing a clear text button).
@@ skipping 211 matching lines @@
   // Disable the RTL arrow menu item. The omnibox sets alignment based on the
   // text in the field, and should not be overridden.
   if ([NSStringFromSelector(action) hasPrefix:@"makeTextWritingDirection"]) {
     return NO;
   }
 
   return [super canPerformAction:action withSender:sender];
 }
 
 @end